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Mortgage Squad Advisors
Affordability

How much mortgage can I afford? Let’s work it out honestly.

Affordability in Canada isn’t one number — it’s where your income, GDS and TDS ratios, the stress test, your down payment and your existing debts all meet. This guide shows how lenders decide, so you can shop with a real budget instead of a guess.

GDS & TDS ratiosThe mortgage stress testIncome vs. debtsDown payment impactWhat it means in home priceRun the calculator
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Written by the Mortgage Squad Advisors Editorial Team · Reviewed by Surrayya Afzal, Principal Broker, FSRA #M14001433 · Updated July 2026

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Most buyers start with a house price, fall in love, and only then find out what a lender will actually approve. That’s the wrong way around — and it’s how people either overextend or lose a deal at the financing stage. Lenders don’t care what a home costs; they care about ratios. They measure the share of your income going to housing (GDS) and to all debts (TDS), then re-run everything at a higher “stress-test” rate to make sure you’d still cope if rates rose. Understand those levers and you can size a realistic budget before you ever book a showing — and know exactly which numbers to improve if you want to borrow more.

Two people signing mortgage documents beside a set of house keys
On this page
  1. How much mortgage can I afford — the honest short answer
  2. GDS and TDS: the two ratios that decide your budget
  3. The stress test: why you qualify at a higher rate than you pay
  4. Down payment, insurance, and what it all means in home price
  5. FAQ

How much mortgage can I afford — the honest short answer

There isn’t a single magic number, because affordability in Canada is the meeting point of four moving parts: your income, your existing debts, your down payment, and the rate you’re qualified at. Lenders don’t start with a home price the way buyers do — they start with your income and work out how much of it can safely go toward housing and debt. That’s why two people earning the same salary can be approved for very different amounts: one carries a car loan and a credit-card balance, the other doesn’t.

The practical way to get a real answer is to model it, not guess it. Enter your income, down payment and monthly debts into our mortgage affordability calculator and it applies the same ratio-and-stress-test logic a lender uses, returning both a maximum mortgage and a maximum home price. This guide walks through each lever behind that number so you understand why it lands where it does — and how to move it. If you’re buying your first place, pair it with our first-time home buyer mortgage hub for the full roadmap from budget to keys.

GDS and TDS: the two ratios that decide your budget

Canadian lenders size your mortgage using two debt-service ratios. GDS (Gross Debt Service) is the share of your gross monthly income consumed by housing costs — principal and interest, property taxes, heating, and half of any condo maintenance fees. TDS (Total Debt Service) takes that and adds every other monthly debt payment: car loans, credit-card minimums, lines of credit, student loans, support payments. Lenders keep GDS under a guideline cap (39% for CMHC-insured loans) and TDS under a higher one (44%), though the exact thresholds vary by lender and by whether the mortgage is insured.

The reason this matters for you is that TDS is where your other debts silently eat your home budget. Every dollar of monthly debt payment is a dollar that can’t go toward a mortgage payment, and the effect compounds because these ratios are calculated at the elevated stress-test rate, not your real rate. It’s common for a modest car payment and a carried credit-card balance to knock a meaningful chunk off a maximum mortgage. If your affordability number comes back lower than you’d hoped, the ratios usually point straight at the fix: raise qualifying income, lower monthly debts, or increase the down payment.

The stress test: why you qualify at a higher rate than you pay

Every insured mortgage, and every uninsured mortgage from a bank or other federally regulated lender, is subject to a stress test. Rather than qualifying you at the rate you’ll actually pay, the lender qualifies you at the higher of your contract rate plus two percentage points, or 5.25%. So even if you lock a lower rate, your GDS and TDS are calculated as though your payment were larger. This deliberately shrinks the maximum you can borrow.

It can feel frustrating, but the logic protects you: it’s a buffer so that if rates are higher when you renew, the payment doesn’t become unmanageable. The practical takeaway is that your affordability is tied to the qualifying rate, not the headline rate you see advertised — which is why a rate drop doesn’t increase your budget as much as buyers expect. Our mortgage stress test calculator shows exactly how much the test moves your number, and our income-required-for-mortgage tool works the same math in reverse from a target price.

Down payment, insurance, and what it all means in home price

Your down payment does two jobs. First, it sets how much of the purchase you’re financing — a larger down payment means a smaller mortgage and a higher reachable price. Second, it decides whether you need mortgage default insurance: with less than 20% down you’ll need mortgage default insurance (only available on homes priced under $1.5 million), while 20% or more avoids it and opens up conventional pricing. Canada’s minimum down payment is 5% on the first $500,000 of price and 10% on the portion from $500,000 up to $1.5 million, so the required amount rises with price. Model the options with our down payment calculator and, if you’ll be insured, our CMHC insurance calculator.

Finally, remember that an approved mortgage amount isn’t the same as an affordable home price. Property taxes, heating, condo fees and closing costs all sit on top, and the lender’s ceiling is not a spending target — it’s the maximum, and a comfortable budget usually sits below it. The smart sequence is: estimate with the affordability calculator, decide on a payment you’re genuinely happy with, then lock the number with a pre-approval. With access to 100+ lenders and FSRA brokerage licence #13737, we can also point you to the lenders whose ratio and income policies stretch furthest for your situation — still weighing rent vs. buy is a fair first step too.

What you get

Why Canadians choose Mortgage Squad Advisors.

Understand the two ratios lenders live by — GDS (housing costs) and TDS (all debts) — and the guideline caps
See how the federal stress test qualifies you at a higher rate than you’ll actually pay
Learn how your down payment size changes both your maximum price and whether CMHC insurance applies
Grasp how car loans, credit cards, lines of credit and student debt quietly shrink your budget
Translate an approval amount into a realistic home price once taxes and heating are counted
Know which levers move affordability most — income, debts, down payment, amortization
Avoid the classic mistake of shopping above what financing will support
Get a clear list of what to fix if the number comes back lower than you hoped
Compare your estimate across 100+ lenders whose ratio flexibility varies
Walk into showings with a budget a lender will actually stand behind
How it works

Three simple steps, no pressure.

  1. 1

    Gather your real numbers

    Pull together gross household income, your down payment, and every monthly debt payment — cards, car, lines of credit, student loans. These are the exact inputs a lender plugs into GDS and TDS. No bureau pull needed to start estimating.

  2. 2

    Run it through the ratios and stress test

    Use our mortgage affordability calculator to apply the GDS/TDS caps at the stress-test qualifying rate. It converts your income and debts into a maximum mortgage, then a maximum home price — the same logic a lender uses, in seconds.

  3. 3

    Pressure-test and pre-approve

    Once you have a range, a broker sanity-checks it against real lender policies and gets you pre-approved so the number is confirmed, not assumed. Now you can shop with a budget that holds up when it’s time to finance.

Start your pre-approval — 5 min
FAQ

Common questions, answered.

Don’t see yours? Ask Maya — instant answer, any time.

How much mortgage can I afford in Canada?
It depends on four things working together: your gross income, your monthly debts, your down payment, and the stress-test rate. Lenders cap the share of income going to housing (GDS, 39% for CMHC-insured loans) and to all debt (TDS, 44%)1, then qualify you at the greater of your contract rate plus 2% or 5.25%2. The fastest honest answer is to run your own numbers through our mortgage affordability calculator, then confirm with a pre-approval.
What are GDS and TDS ratios?
GDS (Gross Debt Service) is the percentage of your gross monthly income that goes to housing — mortgage payment, property taxes, heating, and half of any condo fees. TDS (Total Debt Service) adds all your other debt payments on top. Lenders use guideline caps (often around 39% GDS and 44% TDS, though some lenders and insured programs flex a little) to decide the maximum they’ll lend.
What is the mortgage stress test and how does it affect me?
The stress test requires lenders to qualify you at the higher of your contract rate plus two percentage points, or 5.25%2. It applies to every insured mortgage and to uninsured mortgages at banks and other federally regulated lenders. In plain terms, you have to prove you could afford a payment at a rate higher than the one you’ll actually pay. It lowers the maximum you can borrow, but it exists so a rate increase at renewal doesn’t push you over the edge. Our stress-test calculator shows the impact on your number.
How does my down payment change what I can afford?
A larger down payment increases your maximum purchase price and reduces your loan. It also determines whether you need mortgage default insurance: with less than 20% down you’ll need mortgage default insurance, which is only available on homes priced under $1.5 million, while 20% or more avoids it. The minimum down payment is 5% on the first $500,000 of price and 10% on the portion from $500,000 up to $1.5 million; at $1.5 million or more you need 20%3. Owner-occupied 3-4 unit homes need at least 10%. See our down payment calculator to model options.
Do my debts really reduce how much I can borrow?
Significantly. Every monthly obligation — car loan, credit-card minimums, lines of credit, student loans — counts in your TDS ratio and directly lowers the room left for a mortgage payment. As a rough sense, a few hundred dollars of monthly debt payments can trim tens of thousands off your maximum mortgage. Paying down or clearing high-payment debts before you apply is often the single fastest way to increase affordability.
How much income do I need for the mortgage I want?
Work it backwards from the ratios: your target housing cost shouldn’t exceed roughly 39% of gross income (GDS), and total debts roughly 44% (TDS), calculated at the stress-test rate. Because the exact figure depends on rates, taxes, heating and your debts, the reliable path is to enter your target price into our income-required-for-mortgage tool rather than rely on a rule of thumb.
Does a longer amortization let me afford more?
Yes, modestly. Stretching amortization (for example from 25 to 30 years) lowers the monthly payment, which improves your GDS/TDS ratios and can raise your maximum mortgage. The trade-off is more total interest over the life of the loan. Insured mortgages are limited to 25 years, except that since December 15, 2024 first-time buyers and buyers of new builds can take 30 years4; uninsured mortgages can often go to 30 years. A broker can tell you what you qualify for.
Is the amount a lender approves the same as what I should spend?
No — and this is important. A pre-approval tells you the ceiling; your comfortable budget is often below it. The lender’s ratios don’t know about your savings goals, childcare, travel, or lifestyle. We encourage buyers to choose a payment they’re happy living with, not the maximum the formula allows, so the home stays affordable when life changes.
How do I confirm my real number?
Estimate first with the calculator, then get a pre-approval. A pre-approval runs your actual income documents and credit through real lender policies, so the figure is confirmed rather than assumed — and it shows sellers you’re serious. As a brokerage with access to 100+ lenders, we can also tell you which lenders treat your income or debts more generously.

Related products

Affordability calculatorFirst-time buyer mortgageIncome required for a mortgageStress test calculatorDown payment calculatorGet pre-approvedFirst-time buyer closing costsRent vs. buyMortgage payment examplesAffordability by city

Sources & references

Figures on this page are sourced below and re-checked each quarter. Rates, insurer rules and lender policies change — confirm anything you plan to act on with a licensed advisor.

  1. 1. CMHC, What are the general requirements to qualify for homeowner mortgage loan insurance? (accessed September 2026) — For CMHC-insured homeowner loans, GDS generally shouldn't exceed 39% and TDS 44% of gross household income.
  2. 2. OSFI, Minimum qualifying rate for uninsured mortgages (accessed September 2026) — Uninsured borrowers qualify at the greater of the contract rate plus 2% or 5.25%; OSFI does not expect the test on uninsured straight switches at renewal (no increase in amount or amortization).
  3. 3. Financial Consumer Agency of Canada, Saving for a down payment (accessed September 2026) — Minimum down payment: 5% of the first $500,000, 10% of the portion from $500,000 to $1.5M, 20% at $1.5M or more.
  4. 4. Department of Finance Canada, Government announces boldest mortgage reforms in decades (Sep 16, 2024) (accessed September 2026) — From December 15, 2024: insured-mortgage price cap raised from $1M to $1.5M; 30-year amortization for all first-time buyers and all buyers of new builds.

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